Electrical liquid heater



Dec. 1, 1931. H H. CUSHMAN ELECTRICAL LIQUID HEATER Filed Jan. 93 I: Sheets-Sheet l I n ventor Hark v17, 62457222; a),

Dec. 1, 1931. H cus 1,834,269

ELECTRICAL LIQUID HEA'IfER Filed Jan. 15. 1950 a Sheets-Sheet 2 P r KIA w 2 Q 2 i 2,

J Liz? Inventor firZayffus/wrzmz,

A itorney Dec. 1, 1931. H. H CUSHMAN ELECTRICAL LIQUID HEATER Filed Jan- 1 1950 5 SheetsSheet 3 w a m m a k 0 0 QM. M.

w xk o o ww Z \M W 1.. 0 o 0 J]! A ttorney Patented Dec. 1, 1931 UNITED "STATES HARLEY H. CUSHMAN, OFLODI, WISCONSIN ELECTRICAL LIQUID HEATER Application filed January 15, 1930. Serial No. 420,931.

This invention appertains to new and useful improvements in electrical heaters, and more particularly to a heater of the immersion type. J

The principal object of this invention is to provide a portable'liquid heater which is capable of being disposed within a volume of water for the purpose of heating the same.

Another important object of the invention 9 is to provide an electricwater heateiywherein the heating element is thoroughly protected from the counter-action of the liquid in which the heater is placed. 7 1

Other important objects and advantages of the invention will become more apparent to the reader after considering the invention as described and claimed hereinafter.

In the drawing" Figure 1 represents a top plan view of the novel heating device.

Fig. 2 represents a longitudinal sectional view through the heater.

Fig. 3 represents a cross sectional View of the device.

Fig. 4: represents an enlarged fragmentary horizontal sectional View of the heating unit.

Fig. 5 represents a plan view and diagrammatic View of the heating elements and their connections.

Fig. 6 is a perspective view of the heater. Fig. 7 represents a side elevational View of the heater. 7

Fig. 8 represents a fragmentary sectional view of the conductor cable connection with the heater.

Fig. 9 represents a fragmentary side elevational view of one of the end walls.

Referring to the drawings, wherein like numerals designate like parts, it can be seen that the novel unit is constructed of a pair.

of end walls 6 and 6, the end walls 6 being provided wlth a rectangular shaped opening 7. These end walls G6 are connected b the 11 er and lower walls 8 and 9 resoecmediate portions of the rectangular-shaped shells 12-12, which enclose the cores 13 on which the heating elements 14 are wound.

Each of these cores 13has its longitudinal edge portionprovided with notches 15, through which the heating element '14 is to trained, andwithintermediate pairs of openings 16 through which the heating elem'entis further trained. The ends of the heating element of each core, are disposed through' the openings 17 and are connected to the connectors or binding members 18-118.

The members 1818 are located in longitudinally spaced relation on the dielectric block '19. This block v19 is of semi-circular shape in cross section and engages against the 05 plate 20. v

It will be noted that the'heati ng elements 14.- are thoroughly insulated from the shells 12 by linings 12 of some suitable di-elcc'tric material.

a As is clearly show-n inFig/t), a =lug .21 projects inwardly for supportingthe uppershell 12, so that the upper shell is maintained on a horizontal plane. The lower shell restso n end wall 6 and this-plate 22 is openat its intermediate portion, and'from the edge portion-of this opening, projectsthe hood 24;, which hood to is semi-circular in cross section, toaccoinmodate the block 19, in substantiallyithemanner as shown in Fig. 2. r

The hood 24, is provided with an outwardly disposed inter-threaded nipple 25,:through which tl e conductor 26 leads to connect with the connectors 18 18. This conductor 25 is disposed through the jam'b nut, which tnnt.27 is engaged within the nipple 25 .to compress the packing 28. a

A shield of tubular constructionand noted by the numeral 29 is disposed over the conductor '26 and nipple 25 is secured tothe conductor 26 by asplitclampSO.

It can thus be seen that when thedev-ice is assembled in the manner clearly shown in the drawings, it can be easily conveyed from rificing any of the valuable heating surface, or heat developed.

A bore 28 extends through the nipple 25 and is enlarged at one end to provide a valve chamber 29 within which the valve elements 36 operate. A screw plug 37 with a vent therethrough closes the enlarged portion of the bore to prevent displacement of the valve element 36. This valve permits air to escape from the shells when the same is expanded by the heat from the heating elements and then when the current is turned off, the valve will. close and prevent air from entering the shell so that a partial vacuum is produced in the valve whereby when the current is turned on again, the elements will quickly become hot and transmit their heat to the water in which the device is placed.

Attention is called to the fact that the heat ing elements are in close contact with the in sulating l2 and that these linings are in close contact with the shells so that the heat from the elements is quickly transmitted through the water.

Furthermore, while the foregoing description specifically sets forth the invention, it is to be understood that numerous changes in the shape, size, and materials may be resorted to without departing from the spirit and scope of the invention as claimed hereinafter.

Having thus described my invention, what I claim as new is 1. A heater of the class described comprising a frame, a shell carried thereby and having its side portions spaced from the frame, a hood attached to one end of the frame and enclosing one end of the shell, the other end of the shell being closed, a heating element in the shell, a lining of non-conducting material surrounding the element and in close contact therewith, and said lining also contacting the inner wall of the shell, a conductor for the heating element passing through the hood, a nipple on the hood through which the conductors pass, a tube connected with the nipple, through which the conductors pass, and means for connecting the hood to the frame and shell, the nipple to the hood and the tube to the nipple in a water proof man nor.

2. An immersion heater of the c ass described comprising a frame havin openings therein, a shell supported in the frame and having sides spaced from the frame, one end of the shell being closed, a hood. connected with one end of the frame and in communication with the opposite end of the shell, a nipple connected with the hood, a tube conneeted with the nipple, a heating element in the shell, a lining of non-conducting material placed between the heating element and the shell and in close contact with both conductors for the elements passing through the hood, the nipple and the tube, said nipple having an air passage therein connecting the shell with tl e tube, and an outwardly opening check valve in the passage for permitting air to escape from the shell and preventing air from entering the shell.

3. An immersion heater of the class described comprising a casing-like frame havings openings therein, a number of shells located within the frame, and spaced from each other and from the walls of the frame, said shells extending parallel to the side walls of the frame, and being of rectangular shape in cross section, one end of each shell being closed, a hood connected with one end of the frame having communication with the other end of each shell, an electric heating element in each shell and insulated therefrom, a tubular member connected with the hood in a liquid-tight manner, and the hood being connected with the frame in a liquid-proof manner, conductors connected with the heating elements, passing through the hood and tubular member, and valve means for permitting air to escape from the shells into the tubular member, but preventing air from passing from the tubular member into the shells.

In testimony whereof I aflix my signature.

HARLEY H. CUSHMAN. 

